If CAL can fly a B777 nonstop from Newark to HKG, why can't UAL fly a flight from IAD to HKG? There are plenty of polar routes. I think flights from Dulles to Chek Lap Kok (?) nonstop would be very profitable.

A UA flight IAD-HKG with a "brief stopover" at LAX can hardly be considered an earth-shattering flight, as you have to change aircraft anyway. You might as well be flying from anywhere else in the US, and changing planes at LAX. DONG DONG DONG, you lose the game. But as stated earlier, thanks for playing...